Figure 2b. Sporadic Creutz-feldt-Jakob disease in a 65-year-old man 10 weeks after the onset of dementia, insomnia, and optical hallucinations and 4 weeks before the appearance of periodic synchronous discharges on the EEG. (a) Axial T2-weighted image shows no abnormalities. (b) Diffusion-weighted image shows bilateral areas of abnormal high signal intensity in the cerebral cortex, caudate nuclei, putamen, and thalamus.